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采用焊接热模拟方法、金相分析和扫描电镜试验,研究了不同峰值温度对2.25Cr1Mo0.25V钢焊接热影响区显微组织及断口形貌的影响。结果表明,峰值温度分别为750与850℃时,断口形貌为韧窝断裂。峰值温度为1000℃时,韧窝数量更多且分布均匀。峰值温度分别为1200与1320℃时,断口形貌为解理断裂。断裂方式从韧窝型变为解理型。
The effects of different peak temperatures on the microstructure and fracture morphology of heat-affected zone of 2.25Cr1Mo0.25V steel were studied by means of welding thermal simulation, metallographic analysis and scanning electron microscopy. The results show that when the peak temperature is 750 and 850 ℃ respectively, the fracture morphology is dimpled. When the peak temperature is 1000 ℃, the number of dimples is more and the distribution is even. When the peak temperature is 1200 and 1320 ℃ respectively, the fracture morphology is cleavage fracture. Fracture from dimple to cleavage type.